Resources for medieval musicology and liturgy
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The first part of your argumentation is very convincing. I'm pleased that this supports our version in Graduale Novum II, page 71. Again a wonderfull piece of work.
Concerning the si-b-molle you want to include in this melody: I can't follow the arguments. Testifying them by Roman melodies is doubtfull and I can't be pleased with the scandicus quilismaticus la-sib-do.